ACRYLITE® Soundstop XT

Transparent Noise Barriers


ACRYLITE® Soundstop XT is a highly transparent specialty grade of extruded acrylic.


In addition to the well-known and proven properties of ACRYLITE®, such as:

  • Excellent light transmission and brilliance
  • Extremely high weather resistance
  • Ease of fabrication
  • High surface hardness
  • Lightweight – half the weight of glass
  • 11 times the impact strength of glass

ACRYLITE® Soundstop XT offers the following special features:

  • Many traditional sound barriers create a tunnel effect when driving, but the transparency of ACRYLITE® Soundstop XT allows for more comfortable driving conditions.
  • ACRYLITE® Soundstop XT offers a superior sound reduction rating (STC) of 32 dB or higher by ASTM E90.
  • Large noise barrier panels reduce the need for steel supporting structures and enhance the transparency of the noise barrier.
  • ACRYLITE® Soundstop XT may be available in transparent colors.


These properties make ACRYLITE® Soundstop XT especially suitable for:

  • Noise control along roads and railways
  • Wind barriers on bridges
  • Impact resistant glazing for pedestrian bridges and trails/greenways


  • ACRYLITE® Soundstop XT can be machined just like standard ACRYLITE®

Physical forms

ACRYLITE® Soundstop XT is available in the following sizes and thicknesses:

Length: up to 16ft (5m)

Width: up to 8ft (2.4m)

Thicknesses: 15, 20, 25 mm

  • Custom lengths and widths may be available upon request
3809b photo 1

Typical Values – ACRYLITE® Soundstop XT

Physical PropertiesTest StandardACRYLITE® Soundstop XT (a)
Specific Gravity ASTM D792 1.19

Tensile Strength

Elongation at Break (%)

Modulus of Elasticity


10,000 psi (69 MPa)


400,000 psi (2800 MPa)

Flexural Strength

Modulus of Elasticity


17,000 psi (117 MPa)

480,000 psi (3300 MPa)

Compressive Strength (Yield) ASTM D695 17,000 psi (117 MPa)
Rockwell Hardness ASTM D785 M-93
Resistance Against Stone Projectiles (15mm) EN 1794-1 Pass
Impact-Windborne Debris in Hurricanes ASTM E1996 Pass
Unnotched Charpy Impact, 5 years natural outdoor weathering ASTM D4812 6.5 ft-lbs/in2
Optical (Colorless)
Refractive Index ASTM D542 1.49

Initial Light Transmission

15 years natural outdoor weathering

ASTM D1003



Initial Haze

15 years natural outdoor weathering

ASTM D1003



Initial Yellowness Index

15 years natural outdoor weathering




Resistance to Brushfire (15 mm thickness) EN 1794-2 Class 2
Deflection Temperature under load, 264 psi (1.82 MPa) ASTM D648 195°F (91°C)
Coefficient of Linear Expansion ASTM D696 0.000040 in/in/°F (0.072 mm/m °C)
Vicat Softening Temperature ASTM D1525 220 °F (105°C)
Flammability, Burning Rate (15 mm thickness) ASTM D635 0.6 in/min (15 mm/min)
Self-Ignition Temperature ASTM D1929 850°F (455°C)
Smoke Density Rating (15 mm thickness) ASTM D2843 20%
Service Temperature -

< 160°F (71°C)

Sound Transmission
Sound Transmission Class (STC) ASTM E90

15 mm 32 dB

20 mm 34 dB

25 mm 36 dB

Weight per Square Foot

15 mm Thickness

20 mm Thickness

25 mm Thickness

3.66 lb/ft2 (17.9 kg/m2)

4.86 lb/ft2 (23.8 kg/m2)

6.1 lb/ft2 (29.8 kg/m2)

(a) Typical values: should not be used for specification purposes.